A vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office Excel. Exploitation requires that the attacker coerce the target into opening a malicious .XLS file. The specific flaw exists within the parsing of the BIFF file format used by Microsoft Excel. During the processing of a malformed tag a heap allocation can be adversely controlled. When user supplied data is copied to a heap buffer the resulting data results in a arbitrary memory overwrite. If successfully exploited this could lead to system compromise under the credentials of the currently logged in user.
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